Any horrendous pair of shoes that catch your eye whilst shoe shopping.
The mere sight of the shoe triggers a subconscious impulse to grip that ugly son of a bitch and throw it halfway across the store.
The shoe usually ends up hitting someone on the side of the head or striking the back of one's calf causing injury...like a weapon.

Curly: "Hey, whats up, names Curly...check out my new pair of Crocs."

Trent: "Fuck you Curly, those kicks are some weapons. In fact the other day I threw those joints and killed a mother and her child."